//
//  UIButton+Extension.swift
//  sinaWB
//
//  Created by Macdav on 16/4/7.
//  Copyright © 2016年 Dav. All rights reserved.
//

import UIKit

extension UIButton {

    //便利构造函数
    convenience init(imageName:String,backImageName:String){
        self.init()
        
        setImage(UIImage(named: imageName), forState:UIControlState.Normal)
        setImage(UIImage(named: imageName+"_highlighted"), forState: UIControlState.Highlighted)
        setBackgroundImage(UIImage(named: backImageName), forState: UIControlState.Normal)
        setBackgroundImage(UIImage(named:backImageName+"_highlighted"), forState: UIControlState.Highlighted)
//        根据背景图片的大小设置尺寸
        sizeToFit()
    }

}
